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<h1>v_rotqc2qr
</h1>

<h2><a name="_name"></a>PURPOSE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
<div class="box"><strong>V_ROTQC2QR converts a matrix of complex quaternion row vectors into real form</strong></div>

<h2><a name="_synopsis"></a>SYNOPSIS <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
<div class="box"><strong>function qr=v_rotqc2qr(qc) </strong></div>

<h2><a name="_description"></a>DESCRIPTION <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
<div class="fragment"><pre class="comment">V_ROTQC2QR converts a matrix of complex quaternion row vectors into real form

 Inputs: 

     QC(2m,...)   array of complex-valued quaternions

 Outputs: 

     QR(4m,...)   array of real-valued quaternions

 The complex-valued quaternion [r+j*b  a+j*c] becomes [r a b c]</pre></div>

<!-- crossreference -->
<h2><a name="_cross"></a>CROSS-REFERENCE INFORMATION <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
This function calls:
<ul style="list-style-image:url(../matlabicon.gif)">
<li><a href="v_rotqr2ro.html" class="code" title="function r=v_rotqr2ro(q)">v_rotqr2ro</a>	ROTQR2RO converts a real quaternion to a 3x3 rotation matrix</li></ul>
This function is called by:
<ul style="list-style-image:url(../matlabicon.gif)">
</ul>
<!-- crossreference -->


<h2><a name="_source"></a>SOURCE CODE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
<div class="fragment"><pre>0001 <a name="_sub0" href="#_subfunctions" class="code">function qr=v_rotqc2qr(qc)</a>
0002 <span class="comment">%V_ROTQC2QR converts a matrix of complex quaternion row vectors into real form</span>
0003 <span class="comment">%</span>
0004 <span class="comment">% Inputs:</span>
0005 <span class="comment">%</span>
0006 <span class="comment">%     QC(2m,...)   array of complex-valued quaternions</span>
0007 <span class="comment">%</span>
0008 <span class="comment">% Outputs:</span>
0009 <span class="comment">%</span>
0010 <span class="comment">%     QR(4m,...)   array of real-valued quaternions</span>
0011 <span class="comment">%</span>
0012 <span class="comment">% The complex-valued quaternion [r+j*b  a+j*c] becomes [r a b c]</span>
0013 
0014 <span class="comment">%</span>
0015 <span class="comment">%      Copyright (C) Mike Brookes 2000-2018</span>
0016 <span class="comment">%      Version: $Id: v_rotqc2qr.m 10865 2018-09-21 17:22:45Z dmb $</span>
0017 <span class="comment">%</span>
0018 <span class="comment">%   VOICEBOX is a MATLAB toolbox for speech processing.</span>
0019 <span class="comment">%   Home page: http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html</span>
0020 <span class="comment">%</span>
0021 <span class="comment">%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%</span>
0022 <span class="comment">%   This program is free software; you can redistribute it and/or modify</span>
0023 <span class="comment">%   it under the terms of the GNU General Public License as published by</span>
0024 <span class="comment">%   the Free Software Foundation; either version 2 of the License, or</span>
0025 <span class="comment">%   (at your option) any later version.</span>
0026 <span class="comment">%</span>
0027 <span class="comment">%   This program is distributed in the hope that it will be useful,</span>
0028 <span class="comment">%   but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
0029 <span class="comment">%   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the</span>
0030 <span class="comment">%   GNU General Public License for more details.</span>
0031 <span class="comment">%</span>
0032 <span class="comment">%   You can obtain a copy of the GNU General Public License from</span>
0033 <span class="comment">%   http://www.gnu.org/copyleft/gpl.html or by writing to</span>
0034 <span class="comment">%   Free Software Foundation, Inc.,675 Mass Ave, Cambridge, MA 02139, USA.</span>
0035 <span class="comment">%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%</span>
0036 <span class="keyword">persistent</span> a b
0037 <span class="keyword">if</span> isempty(a)
0038     a=[1 3 2 4];
0039 <span class="keyword">end</span>
0040 s=size(qc);
0041 s(1)=2*s(1); <span class="comment">% each complex number needs two reals</span>
0042 qr=reshape([real(qc(:).'); imag(qc(:).')],4,[]);
0043 qr=reshape(qr(a,:),s);
0044 <span class="keyword">if</span> ~nargout
0045     qr=qr(1:4); <span class="comment">% just select the first one</span>
0046     <a href="v_rotqr2ro.html" class="code" title="function r=v_rotqr2ro(q)">v_rotqr2ro</a>(qr(:)); <span class="comment">% plot a rotated cube</span>
0047 <span class="keyword">end</span></pre></div>
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